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Патент USA US2411356

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NOV. 19, 1946.
B_ P_ BAKER ET AL
2,411,356
VALVE MECHANISM FOR COMPRESSED GAS CIRCUIT INTERRUPTERS
‘Filed March 15, 1943
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NOV. 19, 1946.
a p_ BAKER ET AL
VALVE MECHANISM FOR COMPRESSED GAS CIRCUIT INTERRUPTERS
Filed March 15, 1945
2 Sheets-Sheet 2
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INVENTORS
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Ben lam/n FBams'r‘
and ljkvéerflh/ebbk
q tiff‘ Q/ATTORNI;
Patented Nov. 19, 1946
2,411,356
UNITED ‘STATES PATENT OFFICE
2,411,356
VALVE MECHANISM FOR COMPRESSED GAS
.
CIRCUIT INTERRUPTERS
Benjamin P. Baker, Turtle Creek, and Herbert J.
Webb, Forest Hills, Pa., assignors to Westing
house Electric Corporation, East Pittsburgh,
Pa., a corporation of Pennsylvania
‘ Application March 13, 1943, Serial No. 479,066
10 Claims.
(Cl. 137-139)
1
2
The invention relates, generally, to compressed
gas circuit interruptersand, ‘more particularly,
valve and having a by-pass connection which au-'
tomatically directs ?uid under pressure to the
to a valve mechanism for controlling the flow of
opposite side of the piston at the end of the op
erating stroke‘to insure quick closing of the valve.
compressed gas to the circuit interrupter.
In compressed gas circuit interrupters, it is
desirable that the valves operate quickly in re
sponse to the operation of the control electro
magnets and relays, particularly the blast valve
Another object of the invention is the provi
sion of an improved valve mechanism embodying
a ?uid motor operating means to which ?uid un
der pressure is admitted by a relay valve that also
functions to quickly exhaust the ?uid pressure
10 in the motor upon closing of the relay valve.
The control of the blast valve is usually
Another object of the invention is the provision
which controls the ?ow of compressed gas to ex
tinguish the arc drawn by the interrupting con
tacts.
closely coordinated with the contact movement,
of a compressed gas circuit interrupter with an
and it is important that this valve should not
improved high speed valve mechanism that is
only open quickly but should remain open only
very simple, reliable and quick in operation, and
so long as is necessary for the current arc to be 15 economical to manufacture.
extinguished and should then close very quickly
upon deenergization of its control relay in order
to prevent wastage of compressed gas. The rate
of consumption of compressed gas for each pole,
The novel features that are considered charac
teristic of the invention are set forth in particu
lar in the appended claims.‘ The invention itself
both as to structure and mode of operation, to
unit of some gas blast circuit breakers is ?ve or 20 gether with other objects and advantages there
of, will be best understood from the following de
more cubic feet of ‘free gas per 1/60 of a second,
and unless the blast valves close quickly as soon
as the control relay is deenergized, a consider
able quantity of compressed gas will be wasted.
The operating forces used to effect high‘ speed
movement of the valve to open and closed posi
tion are relatively large, and since the available
control energy is usually small, it is desirable that
tailed description of one embodiment of the in
vention when read in conjunction with the ac
companying drawings, in which:
Figure 1 is a side elevational view of a com
pressed gas circuit interrupter embodying the
improved valve mechanism of the invention;
Fig. 2 is an enlarged sectional view of ‘the im
the. force required to initiate operation of the
proved valve operating mechanism; and
valve mechanism should be kept small.
An object of the invention is the provision of
a compressed gas circuit interrupter with an im
valve assembly.
proved high speed valve mechanism which will
voltage compressed air circuit interrupter simi_
open and close very quickly in response to ener
gization and deenerglzation oi the control device
therefor.
Another object of the invention is the provision
of an improved valve mechanism for a fluid cir
cuit interrupter, which is operated at very high
speed to valve open and to valve closed positions
by a relatively large force and yet which requires
only a relatively small control force to initiate
operation of the valve.
‘
Fig. 3 is an enlarged sectional view of the
The invention is illustrated as applied to a high
lar to the circuit interrupter disclosed in the co
“ pending application of Leon R. Ludwig et al., Se
rial No. 431,394, ?led February 18, 1942, now Pat
ent No. 2,394,086, issued February 5, 1946, and
assigned to the assignee of the present invention.
It is to be understood, however, that the im
40 proved valve mechanism of the present inven
tion may be applied to any form of compressed
gas circuit interrupter either as a blast valve
mechanism or as a valve for controlling the fluid
Another object of the invention is the provi
sion'of an improved high speed valve mechanism
motor which operates the contact means.
Referring to Figure 1 of the drawings, the cir
operated by a compressed gas motor to which a
cuit breaker is mounted on a supporting frame
5 and is insulated therefrom by a plurality of
hollow supporting insulators ‘I and 9, only one of
relatively large quantity, of compressed gas is
quickly admitted for effecting high speed oper
ation of the motor and main valve by a com
pressed gas operated relay valve that is, in turn,
controlled by a pilot valve.
‘ Another object of the invention is the provision
of an improved valve mechanism embodying a
the insulators ‘9 appearing in this ?gure. A
housing ll mounted on the insulators l and 9
contains an operating cylinder [3 and piston [5
for actuating the movable contact member I‘! to
open and closed circuit position. The movable
contact member ll extends upwardly through a
?uid operated piston to which ?uid under pres
sure is admitted for effecting opening of the 55 hollow insulator l9 into the chamber of an arc in-.
2,411,356
3
4
terrupting unit 2| secured on top of the insulator
l9. A hollow insulator 23 mounted on top of the
interrupting unit is closed at its upper end by a
cap 25 having a terminal 21 thereon. A station
ary contact member 29 supported by the cap 25
extends downwardlyinto the upperend of thev
chamber of the interrupting unit 2| for engagee
ment by the movable contact member.
and connected to the pipe sections 39 and 43 (Fig.
l). Extending through a side portion of the hous
ing and journaled therein is a rock shaft 5| hav
ing a non-circular portion within the valve hous
ing to which is secured a rocker arm 53. Pivotally
connected to the rocker. arm 53 within the valve
housing is a valve spindle 55. A blast valve ele
.ment Bi is connected to the lower portion of the
Fluid under pressure, in this instance, com—
spindle, and this valve element has a tubular por
pressed air, for extinguishing the arc drawn by'
tion which slides in a guide 51 formed integral
the contact members in the interrupting unit
and for the operating ‘means |3——|5 is stored
and maintained in a tank 3| mounted within the
frame 5, A manifold 33 connected to the tank
3| forms the common air supply for both func
with a valve seat 59 secured within the lower
tions.
.
The opposite ends of the breaker operating cyl
inder I 3 are connected through-pipes 35 and 3'5,
passages of insulators 9 and pipes 38 (only one
of which is visible in Fig. 1), to the manifold 33.
A pair of electromagnetically controlled valve
mechanisms. (not shown) are interposed ‘between
the pipes 3.8 and the manifold 33. for controlling
the. now of opening and closing air to, the cylinder
It to control opening and closing operation of
portion of the valve housing.
The blast valve
element 6| bears tightly against the valve seat
,in the closed position of the blast valve. A yoke
shaped crank‘ lever 63 is secured to the end por
tions of the rock shaft 5| on the outside of the
valve housing, and this crank lever is pivotally
connected to the 'valve operating mechanism
which is shown in Fig. 2.
As has previously been pointed out, it is very
important that the blast valvev should open very
quickly to its full open position. in response to
en'ergization of its control el'ecti‘omagnet.‘ It is.
also important that the blast valve should close
Extending upwardly from the. manifold 33. is a
large diameter section of pipe 3.9 which com.
very quickly upon deenergization of its control
electromagnet and relay in order to prevent.
wastage of compressed air. A considerable oper
ating force is. required to quickly open thev valve
municates through- a blastv valve 4| and a short
against the pressure of the supply air, and yet its. .
the circuit breaker.
section of pipe 53 with the passage through the.
operation must be initiated by relatively small
interior of the hollow insulator ‘I.
force. since the electrical control energy available
The passage
of this insulator communicates through a. pipe 45
with the passage through the hollow insulator ii!
which, in turn, connects with the chamber of the
arc extinguishing unit 2i. When the blast valve
4| opens, ablast of compressed air ?ows from the
for control of the valve is usually small. In. ac
cordance with the present invention, the blast
valve is provided with an improved high speed,
operating mechanism which will‘ open and close
the valve very quickly and yet requires only a. rel
manifold '53 through pipes 3.9, 43, insulator l,
atively small force to. initiate the operation of
pipe 135, and insulator 59' into the arc. extinguisher
the. valve.
2|, where it quickly extinguishes the current are
Referring to Fig. 2, the valve operating‘ mech
drawn between the. contacts, ll’ and 29.
40 anism comprises an. operating cylinder 65' and
When the circuit breaker is. operated to» open.
an operating piston 61 reciprocally movable there
position the‘ tip of the moving contact member
in which is. operatively connected to the crank
if. moves downwardly out of the ‘extinguisher 2i
lever c3 of the blast valve by’ means of a con
necting rod 69' extending through an opening in
and continues its movement some distance down
into. the space within the hollow insulator iii so a; the top wall of the operating cylinder. A pair of
as. to provide an isolating gap. in series with the
concentrically arranged helical compression
interrupting unit 2 la.
springs 'H and, 12 are. disposed within the oper
The circuit breaker alsoincludes a. series iso
ating cylinder between the operating piston and
lating switch (not shown) with a separate com
head of the cylinder. These springs encircle a
pressed air operating motor therefor which is
portion of the connecting rod and serve to bias
pneumatically interlocked with the. motor [3,. Li
the valve operating piston 61; downwardly to its
of the interrupter for sequence operation. and
lower limiting position, thereby biasing the blast
controlled by the same. opening and. closing con
valve 6| to closed position.
trol valves, as disclosed’ in the aforementioned
The blast .valve is adapted to be operated to
copen'dingjapplication of Leon R. Ludwig, et. al.,
open position by admitting compressed air into
SerialNo. 431,394. The disconnecting switch and
the lower end of the valve operating cylinder
its operating. means have notbeen illustrated and
65 beneath the valve piston 57. A rela'y'valve
described in this application since it is unneces
assembly, indicated generally at 13, is provided
sary for a complete understanding of the present
for controlling the ?ow of compressed air to
invention
60 and from the. valve operating cylinder 65. This.
The blast valve 4| is arranged to be opened
relay’ valve 13 comprises a castv housing 15 hav
simultaneously with the Opening control, valve
ing a pair of air passages Ti and 19- adapted to
(not shown) so that a blast, of air is directed to
communicate, respectively, with cooperating pas
the contacts within the interrupting unit as soon
sages Bi and 83 formed in- the cylinder casting
as they begin to separate. Thebl'ast valve is pref
. 85 of the operating cylinder 65. The relay valve
erably arranged to be closed; immediately after
includes an inlet valve element 81' which con
the arc has beencompletely extinguished, in order
trols communication betweenthe passages 11 and
to. conserve compressed‘ air.
l9to control the-admission of. compressed air into
The blast valve mechanism of the present in
the lower end of the operating cylinder 65. The
vention comprises the blast valve 4| of Fig. 1 O valve. element 81 is mounted on a valve stem 89
which, is. shown in. detail in Fig. 3. and. the im
to the top of which is secured an. actuating pis
provedhigh speed-operating means therefor which.
ton 91. The piston‘ 9|.v is movable in' a cylinder
is shown in, detail in‘Fig. 2 of the drawings.
provided in the relay valve housing, and. the.
Referring to Fig. 3,. the: blast valve» 4| has -a
lower portion of. the piston‘ is- formed to-prov-ide
housing 49 which. is removably mounted between 75. an exhaust valve 93 engageable with‘. an exhaust.
2,411,356
5
-
valve seat at the upper end of the central pas
proper position against the casting 85 by means
sageway in the valve. An atmosphere exhaust
of a plurality of cap screws (not shown).
port 95 is formed in the relay valve housing in
The passages 11 and ‘I9 and the inlet valve
communication with the cylinder portion con
element 81 of the relay valve ‘I3 are of relative
taining the actuating piston 9|. The exhaust 5 ly large size so that when the relay valve is open,
valve portion 93 controls communication between
a large quantity of compressed air is admitted
the passageway 19 and the exhaust port 95. The
into the lower end of the blast valve operating
opening in the cylinder portion above the actu
cylinder 65 to very quickly actuate the main blast
ating piston 9I is closed by the screw cap ‘91.
valve to open position. The passages and pilot
A helical compression spring 99 is disposed be 10 valve element of the pilot valve assembly are of
tween the underside of the inlet valve element 81
smaller size, but such that they pass a sufficient
and a screw plug IOI threaded in an opening in
quantity of compressed air to the top of the re
the valve housing immediately below the valve
lay valve operating piston 9| upon opening of
element Bl. The spring 99 serves to bias the
the pilot valve to quickly effect opening of the
relay inlet valve element 81 to closed position 15 relay inlet valve 81. By providing the pneumati
against its seat. In this closed position of the
cally operated relay valve ‘I3 between the blast
inlet valve element 81, the actuating piston 9|
valve operating cylinder and the pilot valve, it
is in its upper limiting position in which the
is possible for the relatively small pilot valve to
exhaust portion 93 formed thereon is in open
pass sui?cient air to the top of the cylinder in the
position.
20 relay valve ‘I3 to open the relay inlet valve 81
The inlet valve element 8‘! of the relay is adapt
which, in turn, connects the pressure source to
ed to be quickly moved downwardly to open posi
the region under the blast valve operating piston
tion by admitting compressed air into the upper
67 through a passage which is many times larger
end of the cylinder above the actuating piston
than Would have been possible by using the pilot
9|. The compressed air drives the piston quickly 25 valve alone for this purpose. By this method a
downwardly, opening the inlet valve element 81,
large quantity of air is admitted to the blast valve
and closing the exhaust valve 93. Compressed air
operating piston under the control of a relative
is thereupon admitted through the passages 8|,
ly small and light pilot valve which requires only
a very small operating force. With this construc
TI, ‘I9 and 83 into the lower end of the main blast
valve operating cylinder 65 for actuating the blast 30 tion it was found possible to reduce the time re
quired to obtain full opening of the blast valve
valve piston 61 to open the blast valve 6|.
to less than two cycles, where prior valve mech
Operation of the relay valve is controlled by an
electromagnetically operated pilot valve assem
anisms required considerably more time to obtain
full opening of the blast valve.
bly, indicated generally at I03. This pilot valve
assembly comprises a small pilot valve housing 35
In addition to opening the blast valve quickly,
it is also very important to close it quickly after
I05 secured to one end of the relay valve housing
interruption of the arc has been accomplished,
‘I5. The housing I05 contains a pilot valve ele
and the control relay deenergized, because for
ment III‘! for controlling the flow of compressed
every cycle that the blast valve remains open
air into the upper end of the relay valve actuating
cylinder above the relay valve actuating piston 40 after deenergization of its control relay, a very
considerable quantity of compressed air‘ is un
III. The pilot valve housing is provided with
necessarily wasted. The provision of the relative
passages I09 and III which communicate, re
ly large exhaust valve 93 and exhaust port 95
spectively, with cooperating passages I I3 and H5
in the relay valve 13 quickly discharges the com~
in the right-hand portion of the relay valve hous
ing ‘I5. The small pilot valve element I0‘! is is I pressed air under the blast valve operating pis
ton '01, thereby permitting very quick closing of
biased to closed position against a valve seat II‘!
the blast valve.
by a small helical compression spring I I9 bearing
In order to close the blast valve quickly it would
against the underside of the pilot valve element.
seem desirable to make the biasing springs ‘II and
In this closed position the pilot valve shuts oil
communication between the passages I09 ‘and 50 ‘I2 very heavy. However, it is apparent that this
would detract from the speed with which the
III. The valve element is secured to a valve
blast valve could be opened. Since the area of
spindle I2I which extends upwardly through an
the blast valve operating piston BI is quite large,
opening in the valve housing and connects to
we have found that even if a small air pressure
the movable armature (not shown) of a control
ling electromagnet I23 mounted on top of the 55 could be applied to the top side of the operating
piston 67, it would greatly facilitate the speed at
pilot valve housing. An exhaust valve element
which the blast Valve could be closed. In ac
I22 on the spindle I2I is arranged to close an
cordance with the present invention, very high
exhaust port I 24 when the pilot valve element III‘I
speed closing of the blast valve is obtained by
is in open position as shown in Fig. 2, and to open
the exhaust port I24 when the pilot valve element 60 providing means for automatically admitting a
quantity of compressed air into the upper end of
IU‘I is in closed position thereby discharging com
the operating cylinder 05 on the closing side of
pressed air above the piston SI and in the passage
the valve operating piston 61 at the time the
I I3 to atmosphere. The pilot valve I0‘! is adapted
blast valve reaches full open position. This air
to be moved downwardly to the open position
65
is trapped in the upper end of the operating cyl
shown in Fig. 2 upon energization of the electro
inder and very materially assists the biasing
magnet I23.
The passages H5 and III, communicate with
the main inlet passage 8| in the casting 85. This
springs to drive the blast valve operating piston
downwardly to quickly close the blast valve. This
automatic admission of compressed air‘ to the
castingSS is secured on the ?ange portion of a 70 upper end of the valve operating cylinder 55 when
pipe section I21 (Fig. 1) which is in communica
the blast valve reaches open position is obtained
tion with the air manifold 33, the inlet passage 8|
by providing a by-pass passage consisting of a
having an enlarged portion I29 which communi
tube I3I and a pipe connection I33, connected
cates directly with the supply pipe I21. The
to the Wall of the blast valve operating cylin
relay valve housing ‘I5 is removably secured in 75 der 65, as shown in Fig. 2. The tube I3I iscone ‘
7
/
nected through the pipe Jsec'tionjto the interior
of the operating cylinder ‘65 at the upper ‘end
8
surev regulating and check ‘valve I35 into then?
per end‘ of theic'ylinder‘65 above'the piston, ?lling
thereof, the lower end of "the tube 133i ‘being con
the space above the 'piston to a pressure almost
nected to the interior of the cylinder at Jan in
equal to the‘pressure .below the piston. ‘The parts
termediate point. The points of connection of
remain ‘in this ‘position until the electroma'gnet
the tube to the operating cylinder are so dis
I 23 'is deenergized‘by its control relay. Upon ‘de
posed that when ‘the blast valve ti is in closed
energization of the e'lectromagnet 123, the pilot
position and the piston is in ‘its lowermost po
valve I101 is ‘returned to closed position, and the
sition, both openings of ‘the ‘tube connections
relay ,valve actuating piston 9| is thereupon
into the cylinder are above ‘the piston. When the 10 moved upwardly by the spring 99 to close the
blast valve reaches full open position ‘and the
inlet valve=element|81 and open the exhaust'valve
operating piston 157 is at the upper end of its
element ‘93. ‘The compressed air in the cylinder
travel, the loweriopening of the tube IE3! into the
space below ‘the blast valve operating piston ‘61
cylinder is below and uncovered by the operat
is thereupon quickly discharged to atmosphere
ing piston ‘El, and the upper connection of the 15 through the dump valve 193 and exhaust port ‘95
tube is disposed above the piston. vThus, after
of the relay valve. The compressed air trapped
the blast valve has been completely opened, com
above the blast valve operating piston 67, aided
pressed ‘air passes from ‘the cylinder space below
by the springs ‘H, '12, thereupon 'quickly moves
the piston into the space at the upper end of
thepiston ‘6'! downwardly to the lower en'd'o'f its
the cylinder‘ 65 above the piston, and the pres 20 travel, effecting high speed closing of the ibla's't
sure in the upper end‘of the piston becomes al
valve‘?l.
most equal to the pressure below the piston.
A bumper 131 is provided on the top wall of the
When the blast valve’ is in this open position,
cylinder '65, and a resilient bumper 139 is car
very little ‘force is necessary to hold it open, and
ried by the central portion of the blast valve op
it is, therefore, possible to almost equalize the 25 erating portion 6‘! to absorb thekinetic energy
force above and below the blast valve operating
of the moving parts at the end of the opening
piston. .A check valve £35 is interposed between
the tube Bi and the pipe connection l33 to keep
the compressed air admitted to the ‘upper end
of the operating cylinder 65 from ?owing back
into the lower end of the cylinder below the pis~
ton. A spring 138 is provided for biasing the
removal and replacement thereof, A screw plug
MI is also provided vfor the pilot valve assembly
topermit access to be had to the pilot valve ['07
check valve I35 to closed position and this spring
serves to control the pressure above and below
and its spring I i9.
.Insome designs it may be permissible to elim
the-main operating piston‘fi‘i when the blast valve
BI is in open position. The spring is adjustable
inate “the relay valve assembly 13 and ‘connect the
pilot valve assembly directly ‘to the fluid motor
by means of a screw plug I38.
of the blast valve ‘for controlling the flow of
Thus by means
of the spring 136 and screw plug 138 the differ
ential pressure on the main piston may be ad~
justed to the desired value. The air trapped
above the operating piston 6”! by the check valve
after the piston reaches .the upper end of its
travel serves to give the operating piston $5 a
large accelerating force toward closed position to
quickly close the blast valve “67! upon deenerg-iZa
tion of the electromagnet E23 and discharge of
compressed air below the blast valve operating
piston 6'! to atmosphere through the exhaust port
‘:‘9 of the relay valve.
The operation of the blast valve mechanism is ,
brie?y as follows: Opening operation of the blast
valve is initiated in response to energization of
the electromagnet I23. Upon energization of the
electromagnet I23, the pilot valve Hi‘i is moved
to open position, thereby admitting compressed
air from the manifold 33 through the passages 81,
TI, Ill and M3 to the top of the relay valve op
erating piston 9|. Compressed air moves the
valve actuating piston 9| downwardly, effecting
opening of the inlet valve element 58'! of the re
lay valve ‘!3, and at the same time closing the ex~
haust valve element 93. A large quantity of com
pressed air is thereupon admitted through the
passages iii, '5'! and 83 into the lower end of the
blast valve operating cylinder 65 beneath the pis
ton 61. Since the piston iii is of relatively large
diameter, it is driven at high speed 'to the upper
end of its travel, thereby effecting quick opening
of the blast valve 8! to its full open ‘position.
When the blast valve reaches full open position
and the piston 67 is at the u-pper'end of ‘its travel,
the opening of the tube I31 into the intermediate
portion of the cylinder 65 is uncovered by the
piston and compressed air from the cylinder space
below the piston passes through the tube 1 3 l ‘pres
movement of the blast Valve. '
The screw plugs 9'! and till provide access to
the movable parts of the relay valve to permit
compressed air to the operating cylinder 65. ‘In
thisinstance, however, opening and closing of the
blast'valve will ‘not be effected as quickly as when
the intermediate relay valve is utilized.
While the invention has been disclosed in ac
cordance ‘with the provisions of the patent
statutes, it is to be understood that various
changes ‘may be made in the construction with
out departing vfrom some of the essential features
of the invention. It is desired, therefore, .thatthe
language of the appended claims vshould be con
strued as broadly as possible ‘in the light of ‘the
prior art.
We claim as our invention:
1. In a compressed gas circuit interrupter, ‘a
high-speed valve mechanism for controlling the
flow ‘of compressed gas to the interrupter com
prising a valve movable to open and to closed po
sitions, a piston operatively related to said valve
and working in ‘a cylinder, means for admitting
compressed-gas to one ‘end of said cylinder to ef
fect high-speed operation of said piston and
valve to open position, and means comprising a
by-pass passage communicating with said ‘cylin
der and opened by said piston when said valve
reaches open position for admitting compressed
gas to ‘the other end ‘of "said cylinder to operate
said piston‘and valve ‘to closed position.
2. A valve mechanism for controlling ?ow of
compressed gas to a circuit interrupter mecha
nism comprising, a valve element movable to open
and to closed position, a piston connected to said
valve element, a cylinder in ‘which said piston is
movable, means for admitting compressed gas
into one end of said cylinder to effect opening of
said valve, element, and means comprising a vby
pass passage ‘communicating with said cylinder
and opened by said piston adjacent the end of ‘its
2,411,356
10 '
travel in valve opening direction for admitting
compressed gas from said one end of said cyl
inder into the other end of said cylinder.
3. A valve mechanism for controlling flow of
to effect high speed operation of said piston to
open said main valve, an exhaust passage for
quickly discharging compressed gas from said one
end of said cylinder to allow quick closing of
compressed gas to a circuit interrupter mecha Cl said main valve, spring means biasing said main
nism comprising, a valve element movable to
valve to closed position, a by-pass passage com
open and to closed position, a piston connected
municating with said cylinder disposed to be un
to said valve, a cylinder in which said piston is
covered by said piston adjacent the end of the
reciprocally movable, means for admitting com
valve opening travel thereof for admitting com
pressed gas into one end of said cylinder to ef 10 pressed gas from said one end of the cylinder into
fect opening operation of said valve element, a
the other end thereof, and a check valve in said
by-pass passage communicating with said cyl
by-pass passage operable to cause said compressed
inder and disposed to be uncovered by the piston
gas to quickly operate said piston and valve to
adjacent the end of its travel in valve opening
closed position upon opening of the exhaust pas
direction to admit compressed gas from said one
sage.
end of the cylinder into the other end, and a check
8. A valve mechanism for controlling ?ow of
valve in said passage.
compressed gas to a circuit interrupter mech
4. A valve mechanism for controlling flow of ,
anism comprising, a valve element movable to
compressed gas to a circuit interrupter mech~
open and to closed position, a piston connected to
anism comprising a main valve element movable 20 said valve, a cylinder in which said piston is re
to open and to closed position, an operating cyl
ciprocally movable, means for admitting com
inder, a piston in said cylinder operatively con
pressed gas into one end of said cylinder to effect
nected to said valve element, means for admitting
opening operation of said valve element, a vby-pass
compressed gas into one end of said cylinder to
passage communicating With said cylinder and
effect opening of said main valve element, a spring 25 disposed to be uncovered by the piston at a point
biasing said main valve element to closed position,
near the end of its travel in valve opening direc
and a by-pa'ss passage communicating with said
tion to admit compressed gas from said one end of
cylinder disposed to be uncovered by said piston
the cylinder into the other end of said cylinder,
during its travel in valve opening direction to ' a check valve in said passage to prevent return
admit compressed gas into the other end of said 30 ?ow of compressed air through said passage to -
cylinder to operate said main valve to closed posi
tion.
5. A valve mechanism for controlling flow of
compressed gas to a circuit interrupter compris
ing, a main valve movable to open and to closed
position, an operating cylinder, a piston in said
cylinder connected to said main valve, means for
admitting compressed gas into one end of said
cylinder to effect movement of said piston to open
the main valve, a by-pass passage in communi
cation with said cylinder disposed to be uncovered
by said piston adjacent the end of its travel to
admit compressed gas into the other end of said
thereby cause the compressed air admitted
through said by-pass passage to quickly operate
said piston and valve to closed position, and ad
justable spring means biasing said check valve
to closed position.
'
9. A valve mechanism for controlling flow of
‘compressed gas to a circuit interrupter mech
anism comprising,’ a valve element movable to
open and to closed position, a piston connected to
said valve element, a cylinder in which said piston >
is movable, means for admitting compressed gas
into one end of said cylinder to effect opening
of said valve element, means comprising a by-pass
cylinder, a check valve in said passage, and a
passage communicating with said cylinder and
passage for exhausting compressed gas from said 45 opened by said piston adjacent the end of its
one end of the cylinder and thereby cause the
travel in valve opening direction for admitting
compressed gas admitted through the by-pass to
compressed gas into the other end of said cylin
the other end of the cylinder to aid in moving the
der, valve means disposed in said by-pass passage,
piston to close the main valve.
and means biasing said valve means, to provide
6. A high speed valve mechanism for'control 50 differential gas pressure in said ends of said
ling flow of compressed gas to a circuit inter
cylinder.
'
rupter comprising, a main valve movable to open
10. A valve mechanism for controlling ?ow of
and to closed position, an operating cylinder, a
compressed gas to a circuit interrupter compris
piston in said cylinder connected to said valve, a
ing, a main valve movable to open and to closed
passage for admitting compressed gas into one
positions, an operating cylinder, a piston in said
end of said cylinder to effecthigh speed movement
cylinder connected to said valve, a passage for
of said piston to open said main valve, an exhaust ‘
admitting compressed gas into one end of said
passage for discharging compressed gas from said
cylinder to open said main valve, a by-pass pas
one end of the cylinder and thereby allow said
sage in communication With said cylinder dis
main valve to close, a spring biasing said main 60 posed to be uncovered by said piston adjacent the
valve to closed position, a by-pass passage in com
end of the valve opening travel to admit com
munication with said cylinder disposed to be un~
pressed gas to the other end of said cylinder, a
covered adjacent the end of the valve opening
check‘ valve in said by-pass passage to prevent
travel of the piston to admit compressed gas to
return flow of gas from said other end of the
‘the other end of said cylinder to operate said 65 cylinder, means biasing said check valve to con
main valve to closed position upon opening of
trol the ?ow of compressed gas to said other end
said exhaust passage, and a check valve in said
of the cylinder, and an exhaust passage effective
by-pass passage.
when open to quickly discharge the compressed
'7. A high speed valve mechanism for control-l
gas from said one end of said cylinder to thereby
ling ‘flow of compressed gas to a circuit inter 70 cause the compressed gas admitted through said
rupter comprising, a main valve movable to‘ open
by-pass at the other end of the cylinder to oper
and to closed position, an operating cylinder, a
ate the piston and‘said main valve to closed po
piston in said cylinder connected to said valve, a‘
sition.
relatively large inlet passage for quickly admit
ting compressed gas into one end of. said cylinder 75
‘ BENJAMIN P. BAKER.
HERBERT J. WEBB.
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